/* 背景图设置 */
body{
	background-image:url(../img/sign_bk.jpg);
	background-size:150% 150%;
	background-repeat:no-repeat center;
}
/* 登录框 */
.signup_box{
	background-color: rgba(255,255,255,0.8);
	height: 420px;
	width:400px;
	margin:30px auto;
	border-radius: 20px;
	padding:50px;
}
.sign-title{
	position: relative;
}
.sign-title>span{
	color: rgba(0,0,0,0.8);
	font-size: 1.5em;
    text-shadow: 5px 5px 5px cornflowerblue;
}
.input-area{
	display: flex;
	flex-direction: column;
	margin-top:30px;
}
.username-label,.password-label,.re-password-label{
	margin-bottom: 10px;
	font-size:1.1em ;
}
#username,#password,#re-password{
	height:25px;
	font-size: 1em;
}
#submitbutton{
	display: block;
	margin:auto;
	cursor: pointer;
	outline: none;
	position: relative;
	top:40px;
	width:100px;
	height:50px;
	font-size:large;
	border: 0;
	border-radius: 10px;
	color: white;
	background-color:cadetblue;
}
#submitbutton:hover{
	background-color: lightblue;
}
.change_link{
	position: relative;
	top:70px;
	left:250px;
}
.to-register{
	text-decoration: none;
	color:royalblue;
}
.to-register:hover{
	color:rgba(0,0,255,0.4);
}
/* 尾部 */
footer {
	margin: auto;
	color: white;
	height: 30px;
	text-align: center;
	line-height: 30px;
	position: relative;
	top:140px;
}